JP4261272B2 - Continuous casting mold - Google Patents

Description

【００２８】
表１から明らかなように、鋳造速度を１．０（ｍ／ｍｉｎ）に設定した場合、長辺銅板１３を使用することにより、溝底（ｃ点、ｄ点）の温度で８℃、表面（ａ点、ｂ点）の温度で１９〜２１℃、従来例の長辺銅板３０よりも低下できることを確認できた。なお、この温度低下は、鋳造速度を高めた場合においても同様であり、鋳造速度を高速の２．０（ｍ／ｍｉｎ）に設定した場合、長辺銅板１３を使用することにより、溝底（ｃ点、ｄ点）の温度で１０〜１１℃、表面（ａ点、ｂ点）の温度で２２〜２６℃、従来例の長辺銅板３０よりも低下できた。
【００２９】
また、鋳造速度を２．０（ｍ／ｍｉｎ）に設定した場合、長辺銅板１３の溝底の温度が１２６〜１３２℃となり、例えば冷却水背圧を０．２（ＭＰａ）としたときの水の沸点温度１３３℃を下回るので、スケール付着の促進を抑えることが可能となる。
一方、鋳造速度を２．０（ｍ／ｍｉｎ）に設定した場合、従来の長辺銅板３０の溝底の温度は１３６〜１４３℃となり、冷却水背圧を０．２（ＭＰａ）としたときの水の沸点温度１３３℃を上回るので、スケールの付着が促進される。
以上のことから、長辺銅板１３を備えた連続鋳造用鋳型を使用することで、高速鋳造にも対応可能で、しかも良好な品質を備えた鋳片を製造できる。
【００３０】
以上、本発明を、一実施の形態を参照して説明してきたが、本発明は何ら上記した実施の形態に記載の構成に限定されるものではなく、特許請求の範囲に記載されている事項の範囲内で考えられるその他の実施の形態や変形例も含むものである。例えば、前記したそれぞれの実施の形態や変形例の一部又は全部を組合せて本発明の連続鋳造用鋳型を構成する場合も本発明の権利範囲に含まれる。
また、前記実施の形態においては、熱伝導性が良好な金属として銅を使用した場合について説明したが、熱伝導性が良好であれば、例えば他の金属や銅合金等を使用することも可能である。
そして、前記実施の形態においては、多数のメニスカス導水部が形成された鋳型本体の裏面側一面に、隣り合う各メニスカス導水部を連通する凹部を形成し、この凹部に閉塞部材を配置した場合について説明したが、各メニスカス導水部の深さ方向の一部に、メニスカス導水部の断面形状に対応した閉塞部材を、それぞれ配置することも可能である。
【００３１】
【発明の効果】
請求項１、２記載の連続鋳造用鋳型においては、鋳型本体で最も高温となるメニスカス部の周辺部の冷却効率を高めることができるので、鋳型本体に対する熱負荷が増大する高速度化した鋳造速度においても、鋳型本体の冷却を適切に行うことができ、安定した品質の鋳片を製造できる。
また、鋳型導水部の深さを、メニスカス導水部の深さよりも浅くすることで、鋳型の製作コストを低減できる。
そして、例えば、冷却水の供給量を従来よりも増加させることなく、メニスカス導水部の鋳型本体の冷却効率を高めることができるので、従来使用されている連続鋳造設備の各装置を変更することなく使用可能な連続鋳造用鋳型を提供できる。
【００３２】
特に、請求項１記載の連続鋳造用鋳型においては、鋳型本体のメニスカス部の冷却効率を高めることができるので、高品質の鋳片を製造でき、安定して鋳造作業を実施できる。
請求項２記載の連続鋳造用鋳型においては、閉塞部材の形状を単純化できるので、例えば閉塞部材の形状加工のコストを低減できて経済的であると共に、製造時における作業性が良好になる。
請求項１記載の連続鋳造用鋳型においては、隣り合う多数の導水溝の間隔を設定するので、導水溝を従来よりも冷却効率が高まるように配置することができ、鋳型本体の冷却効率を更に高めることができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る連続鋳造用鋳型の鋳型本体の長辺銅板の背面図である。
【図２】同長辺銅板の部分拡大図である。
【図３】（Ａ）〜（Ｃ）はそれぞれ図２のａ−ａ矢視断面図、ｂ−ｂ矢視断面図、図１のｃ−ｃ矢視断面図である。
【図４】図２のｄ−ｄ矢視断面図である。
【図５】（Ａ）は数値解析に使用した長辺銅板の水路モデルの背面図、（Ｂ）は（Ａ）のｅ−ｅ矢視断面図である。
【図６】（Ａ）は図５（Ａ）のｆ−ｆ矢視断面図、（Ｂ）は従来例に係る長辺銅板の水路モデルの説明図である。
【図７】（Ａ）、（Ｂ）はそれぞれ数値解析結果に基づく長辺銅板の表面側の温度分布の説明図、裏面側の温度分布の説明図である。
【図８】従来例に係る長辺銅板の表面側の温度分布の説明図である。
【図９】（Ａ）、（Ｂ）はそれぞれ数値解析結果に基づく長辺銅板のメニスカス部の温度分布の説明図、従来例に係る長辺銅板のメニスカス部の数値解析結果に基づく温度分布の説明図である。
【図１０】連続鋳造用鋳型の平面図である。
【図１１】（Ａ）は連続鋳造用鋳型の長辺銅板の説明図、（Ｂ）は（Ａ）のｇ−ｇ矢視断面図である。
【符号の説明】
１０、１１：長辺部材、１２：通水部、１３：長辺銅板、１４：取付け手段、１５：バックプレート（支持部材)、１６：給水部、１７：排水部、１８：雌ねじ部、１９：Ｏリング、２０〜２２：導水溝、２３：メニスカス導水部、２４：鋳型導水部、２５：メニスカス導水部、２６：鋳型導水部、２７：凹部、２８：閉塞部材、２９：ボルト、３０：長辺銅板、３１：導水溝、３２：雌ねじ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous casting mold in which a support member is fixed to the back side of the mold body by an attaching means, and is particularly applicable to high-speed casting with improved cooling efficiency of a meniscus (molten surface) portion of the mold body. The present invention relates to a continuous casting mold.
[0002]
[Prior art]
As shown in FIG. 10, a continuous casting mold (hereinafter also simply referred to as a mold) 70 used in a continuous casting facility includes a pair of narrow cooling members 71 and 72 and a short side member 71. , 72 and a pair of wide-side members 73 and 74, which are wide cooling members, and bolts 75 are attached to both ends of the facing long-side members 73 and 74, and nuts are provided via springs. The configuration is fixed at 76.
The long side members 73 and 74 are mirror-symmetrical and have the same configuration. As shown in FIGS. 10, 11A, and 11B, a large number of water guide grooves 77 are provided in the vertical direction on the back side. A long side copper plate 78 and a back plate 80 (also referred to as a cooling box or water box) fixed to the back side of the long side copper plate 78 by a bolt 79. And the industrial water which is an example of a cooling water is poured into the water guide groove 77 through the drainage part 81 and the water supply part 82 which were each provided in the upper end part and lower end part of the backplate 80, and cooling of the long side copper plate 78 is carried out. Is going. On the other hand, the short side members 71 and 72 have substantially the same configuration, but the width of the short side copper plate 83 of the short side members 71 and 72 is shorter than the width of the long side copper plate 78 of the long side members 73 and 74. The width of the back plate 84 fixed to the back side of the short side copper plate 83 is substantially the same as the width of the short side copper plate 83.
A mold body 85 is constituted by the short side copper plate 83 of the short side members 71 and 72 and the long side copper plate 78 of the long side members 73 and 74.
[0003]
During the continuous casting operation, molten steel is poured from above the continuous casting mold 70 (above the short-side copper plate 83 and the long-side copper plate 78), and the cast as a product is initially solidified by the mold 70 and solidified. The slab is manufactured by continuously drawing from below the mold 70. Although the molten steel temperature poured into the mold 70 and the surface temperature of the slab at the outlet of the mold 70 differ depending on the operating conditions, the molten steel temperature is usually about 1500 ° C., and the surface temperature of the slab at the outlet of the mold 70 is 800 ˜1200 ° C. The inside of the slab here is in an unsolidified state, that is, in a liquid state.
As described above, the molten steel is at a high temperature, and if the short side copper plate 83 and the long side copper plate 78 are not sufficiently cooled, the temperature rises. Therefore, the strength of the copper does not decrease the temperature of the short side copper plate 83 and the long side copper plate 78. It is necessary to keep the temperature below a certain level.
[0004]
Therefore, in order to make the temperature of the short side copper plate 83 and the long side copper plate 78 sufficiently low and to have a uniform temperature distribution, the cooling water provided on the back side of the short side copper plate 83 and the long side copper plate 78 is used. Various techniques have been proposed for adjusting the position of a number of water guide grooves 77 that pass therethrough.
For example, as described in Patent Document 1, the water guide groove between the bolts within the range of 100 mm or less from the vicinity of the meniscus portion of the short side copper plate and the long side copper plate is diverted to the bolt side so as to reduce the distance between them. In this way, a method for cooling the vicinity of the bolt, in which the cooling efficiency is lowered, is disclosed.
Moreover, as described in Patent Document 2, the cross-sectional shape of the water guide groove located at the end of the short side copper plate and the long side copper plate is inclined with respect to the thickness direction of the short side copper plate and the long side copper plate. In addition, a continuous casting mold is also disclosed in which the cooling efficiency of the end portion in the width direction of the short-side copper plate that decreases the cooling efficiency is increased.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2-59144 (FIG. 1)
[Patent Document 2]
Japanese Utility Model Publication No. 61-36341 (FIG. 6)
[0006]
[Problems to be solved by the invention]
However, the above-mentioned continuous casting mold is a proposal for keeping the surface temperature of the copper plate uniform, and in recent years, it has become impossible to cope with the increase in casting speed necessary for improving the efficiency of continuous casting work. ing.
When the casting speed is increased in this way, the amount of heat extracted to the copper plate and the amount of heat taken from the copper plate for cooling the copper plate also increase proportionally, so the life of the copper plate for casting at high speed is shortened.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a continuous casting mold capable of appropriately cooling the mold body even at a higher casting speed.
[0007]
[Means for Solving the Problems]
The casting mold for continuous casting according to the first invention meeting the above object is made of a metal having good thermal conductivity, and has a mold body provided with a water flow portion on the back surface side, and attachment means on the back surface side of the mold body. A continuous casting mold that cools the mold body by flowing cooling water through the water supply section and the drainage section provided in the support member, and a fixed support member.
The water flow portion has a meniscus water conveyance portion disposed vertically with the meniscus portion of the mold body as a center, and a mold water conveyance portion disposed in another part of the mold body in communication with the meniscus water conveyance portion. A plurality of water guide grooves arranged in parallel vertically, the groove bottom of the meniscus water guide section is formed on the surface side of the mold body with respect to the groove bottom of the mold water guide section, and the depth direction of the meniscus water guide section A blocking member for reducing the cross-sectional area of the meniscus water guide portion is disposed at a part of the cooling water, and the flow rate of the cooling water flowing through the meniscus water guide portion is faster or equal to the flow rate of the cooling water flowing through the mold water guide portion. And
Further, the interval between the plurality of adjacent water guide grooves is set to 10 to 30 mm, and the mold is determined by the distance between the adjacent water guide grooves provided in the central portion of the mounting means adjacent in the width direction of the mold body. Narrow the interval between adjacent water guide grooves provided in the vicinity of the attachment means of the main body,
The ratio d / D between the distance d from the surface of the mold body to the groove bottom of the meniscus water guiding portion and the distance D from the surface of the mold body to the groove bottom of the mold water guiding portion is 2/5. 4/5, and from the surface of the mold main body from the distance from the surface of the mold main body to the groove bottom of the meniscus water guide portion provided at the center of the mounting means adjacent in the width direction of the mold main body. The distance to the groove bottom of the meniscus water guide portion provided in the vicinity of the attachment means of the mold body is shortened .
Here, the upper and lower sides with the meniscus portion in the center indicate the upper and lower ranges including the molten steel surface of the mold body located in the range of 50 to 150 mm, for example, the meniscus portion, from the upper end of the mold body. A range from a position 30 mm below the upper end of the mold body to a position 400 mm below the upper end is shown.
[0008]
Thus, since the meniscus water conveyance part is arrange | positioned rather than the mold water conveyance part at the surface side of a mold main body, the cooling efficiency of the peripheral part of the meniscus part which becomes the highest temperature in a mold main body can be improved. In addition, the mold body where the mold water conveyance part is arranged corresponds to the part where the solidified shell (solidified shell) is formed in the peripheral part of the cooled molten steel, so it is necessary to increase the cooling efficiency the further away from the meniscus part Since there is no, the depth of the mold water conveyance part is made shallower than the depth of the meniscus water conveyance part.
Then, a blocking member is disposed on the back side of the meniscus water conveyance section, and the flow rate of the cooling water in the meniscus water conveyance section is made faster than or equal to the flow rate of the cooling water in the mold water conveyance section. It is possible to increase the cooling efficiency of the mold body of the meniscus water guiding portion without increasing the amount.
[0009]
Continuous casting mold according to the first invention along the object, the distance d from the surface before Symbol mold body to the groove bottom of the meniscus water conduit, the surface of the mold body to the groove bottom of the mold water conduit The ratio d / D to the distance D is 2/5 to 4/5.
Thus, by setting the relationship between the groove bottom of the meniscus water guiding portion and the groove bottom of the mold water guiding portion, the cooling efficiency of the meniscus portion of the mold body can be easily increased.
Here, when the ratio d / D between the distance d from the surface of the mold body to the groove bottom of the meniscus water guiding portion and the distance D from the surface of the mold body to the groove bottom of the mold water guiding portion is less than 2/5, There is a risk that the surface temperature at the lower part becomes high and the quality of the slab is deteriorated. On the other hand, when the ratio d / D exceeds 4/5, the difference between the distance d and the distance D becomes small. For example, the depth of the mold water guide portion is comparable to the position of the groove bottom of the meniscus water guide portion. Therefore, it takes time and effort to process the mold body, resulting in poor workability.
Therefore, in order to manufacture a continuous casting mold capable of increasing the cooling efficiency of the meniscus portion of the mold body, the distance d from the surface of the mold body to the groove bottom of the meniscus water guide portion and the surface of the mold body from the mold water guide The ratio d / D to the distance D to the groove bottom of the part is preferably 1/2 to 4/5, and more preferably 3/5 to 4/5.
[0010]
The continuous casting mold according to the second invention that meets the above object is the continuous casting mold according to the first invention, wherein the continuous casting mold according to the first invention is adjacent to the back surface side surface of the mold body on which the plurality of meniscus water guide portions are formed. A concave portion communicating with each of the matching meniscus water guiding portions is formed, and the blocking member made of a metal plate having corrosion resistance is disposed in the concave portion.
[0011]
Continuous casting mold according to the first invention along the object, to set the interval of said number of said water guide groove that fits Ri next to 10 to 30 mm.
Here, for example, when the thickness of the mold main body is set to about 45 mm and the cooling water flow rate is set to about 200 L / min per 100 mm of the mold width, the cooling efficiency of the mold main body can be further improved if the interval between the many adjacent water guide grooves is less than 10 mm. Such a remarkable improvement cannot be expected, and the shape of the mold body becomes complicated, resulting in poor workability during processing. On the other hand, when the distance between the water guide grooves exceeds 30 mm, the distance between the water guide grooves is excessively widened, and the cooling of the mold body in the width direction cannot be performed uniformly, resulting in uneven cooling and resulting in deterioration of the quality of the produced slab. There is a fear.
Therefore, for example, when the thickness of the mold main body is set to about 45 mm and the cooling water flow rate is set to about 200 L / min per 100 mm of the mold width, in order to easily perform the work of the mold main body and improve the slab quality, It is preferable to set the interval between many adjacent water guide grooves to 10 to 25 mm.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a rear view of the long side copper plate of the mold body of the continuous casting mold according to one embodiment of the present invention, FIG. 2 is a partially enlarged view of the long side copper plate, and FIGS. ) Are cross-sectional views taken along arrows aa and bb in FIG. 2, cross-sectional views taken along arrows cc in FIG. 1, and FIG. 4 is a cross-sectional view taken along arrows dd in FIG. (A) is a rear view of a water channel model of a long side copper plate used for numerical analysis, (B) is a cross-sectional view taken along line ee of (A), and FIG. 6 (A) is an ff arrow of FIG. 5 (A). Cross-sectional view, (B) is an explanatory diagram of a water channel model of a long-side copper plate according to a conventional example, and FIGS. 7 (A) and (B) are explanatory diagrams of temperature distribution on the surface side of the long-side copper plate based on numerical analysis results, respectively. 8 is an explanatory diagram of the temperature distribution on the back side, FIG. 8 is an explanatory diagram of the temperature distribution on the front side of the long side copper plate according to the conventional example, and FIGS. 9A and 9B are diagrams of the long side copper plate based on the numerical analysis results, respectively. Meniscus temperature Illustration, an illustration of the temperature distribution based on the numerical analysis results of the meniscus portion of the long side copper plate according to a conventional example.
[0013]
As shown in FIGS. 1 to 4, a continuous casting mold (hereinafter also simply referred to as a mold) according to an embodiment of the present invention includes a pair of wide cooling members 10 and 11 and a pair of wide cooling members. It is manufactured by combining a short side member (not shown) which is a narrow cooling member (see FIG. 10).
[0014]
The long side members 10 and 11 of the continuous casting mold are each made of copper, which is an example of a metal having good thermal conductivity, and a long side copper plate (hereinafter simply referred to as a copper plate) provided with a water passage portion 12 on the back side. 13) and a back plate (also referred to as a cooling box or a water box) 15 which is an example of a support member fixed to the back side of the long side copper plate 13 by the attachment means 14, and extends in the width direction of the back plate 15. The long-side copper plate 13 is cooled by flowing industrial water, which is an example of cooling water, through the water supply unit 12 through the water supply unit 16 and the drainage unit 17 provided. On the surface (cooling surface) of the long side copper plate 13, for example, a coating material such as Ni or Ni—Co alloy is plated or sprayed. In addition, the short side member of the continuous casting mold has substantially the same configuration as the long side members 10 and 11, and the long side copper plate 13 of the long side members 10 and 11 and the short side copper plate of the short side member are molds. A main body is configured, and a mold space is formed inside the mold main body.
Thus, since the short side copper plate differs only in the width from the long side copper plate 13, description is abbreviate | omitted and only the long side copper plate 13 is demonstrated in detail hereafter.
[0015]
As shown in FIGS. 1 to 4, the copper plate 13 (thickness is, for example, about 10 to 100 mm) is formed by female screw portions 18 formed in the copper plate 13 (here, 10 locations at equal intervals in the width direction of the copper plate 13, A back plate 15 made of, for example, stainless steel is provided by attachment means 14 comprising eight vertical positions on the copper plate 13 (a total of 80 places) and male screws (not shown) that are screwed into the female screw portion 18 to fasten the back plate 15. (For example, thickness is about 50-500 mm). In addition, a groove is formed in the periphery of the back plate 15 surrounding the water supply unit 16, the drainage unit 17 of the back plate 15, and the water flow unit 12 of the copper plate 13. And the back plate 15 are improved, and industrial water leakage from the water passage 12 is prevented. In addition, a seal washer that can be waterproofed is disposed in advance in the holes (80 in this case) formed in the back plate 15 in order to attach the male screw, thereby preventing leakage of industrial water from the part to which the male screw is attached. ing.
[0016]
As a result, industrial water is supplied from a water supply port (not shown) provided in the water supply section 16 below the back plate 15, and the water supply section 16 makes the water flow section 12 uniform in the width direction by the water supply section 16 and below the copper plate 13. The industrial water that has flowed from the side to the upper side through the water passing portion 12 is discharged from a drain port (not shown) provided in the drain portion 17 on the upper side of the back plate 15 to cool the copper plate 13.
[0017]
As shown in FIGS. 1 to 3, the water flow portion 12 includes a large number of water guide grooves 20 to 22 that are arranged vertically in parallel on the back surface side of the copper plate 13. These water guide grooves 20 to 22 are substantially linear in the direction of water flow of the water flow portion 12 (that is, vertically), and the groove width is, for example, 3 to 15 mm. A plurality of the water guide grooves 20 are provided in the central portion of the female screw portions 18 adjacent to each other in the width direction of the copper plate 13 (in the present embodiment, three between the adjacent female screw portions 18, a total of 27). Further, a plurality of water guide grooves 21 are provided in the vicinity of the female screw portion 18 excluding the water guide grooves 22 at both ends in the width direction of the copper plate 13 (in this embodiment, two on one side of the female screw portion 18, a total of 36). It has been. And the water guide groove | channel 22 is provided in the width direction both ends of the copper plate 13, respectively.
Here, the interval W1 between adjacent water guide grooves 20 is set to 10 to 30 mm, and the interval W2 between adjacent water guide grooves 21 is set to 10 to 30 mm. In addition, according to the thickness of the copper plate 13, and the flow volume of industrial water, it is also possible to set the space | interval W1 of the adjacent water guide groove 20, and the space | interval W2 of the adjacent water guide groove 21 to 5-30 mm.
In this embodiment, the interval W2 between the adjacent water guide grooves 21 is narrower than the interval W1 between the adjacent water guide grooves 20, and suppresses a decrease in cooling efficiency in the vicinity of the female screw portion 18 where the water guide grooves cannot be formed. ing.
[0018]
Moreover, as shown in FIG.1, FIG.2, FIG.3 (A), FIG. 4, the water conveyance groove | channel 20 contains the meniscus part (for example, 50-150 mm from the upper end of the copper plate 13) of the copper plate 13, and makes it a center. A meniscus water guide portion 23 arranged in a predetermined range (a range of, for example, 30 to 400 mm from the upper end of the copper plate 14) and the meniscus water guide portion 23, and another portion of the copper plate 13, that is, a lower portion of the meniscus portion. The mold water guide section 24 is disposed at the bottom.
Moreover, as shown in FIG.1, FIG.2, FIG.3 (B), FIG. 4, the water guide groove 21 also contains the meniscus part (for example, 50-150 mm from the upper end of the copper plate 13) of the copper plate 13, and makes it the center. A meniscus water guide portion 25 disposed in a predetermined range (a range of, for example, 30 to 400 mm from the upper end of the copper plate 13) and a mold water guide portion 26 that communicates with the meniscus water guide portion 25 and is disposed below the meniscus portion. have.
[0019]
The groove bottoms of the meniscus water guide portions 23 and 25 of the water guide grooves 20 and 21 are formed, for example, at a position about 1/3 to 1/2 of the thickness of the copper plate 13 from the surface of the copper plate 13, and the mold water guide portion 24, 26 is formed on the surface side of the copper plate 13 with respect to the groove bottom. Here, the ratio d1 between the distances d1 and d2 from the surface of the copper plate 13 to the groove bottoms of the meniscus water guiding portions 23 and 25 and the distances D1 and D2 from the surface of the copper plate 13 to the groove bottoms of the mold water guiding portions 24 and 26. / D1 and d2 / D2 are set to 2/5 to 4/5, respectively. Note that the distance d2 is shorter than the distance d1 and the distance D2 is shorter than the distance D1, thereby suppressing a decrease in cooling efficiency in the vicinity of the female screw portion 18 where a water guide groove cannot be formed.
As shown in FIGS. 1, 2, and 3 (C), the water guide groove 22 has substantially the same cross-sectional shape from the lower end portion to the upper end portion.
[0020]
Thus, since each water guide groove 20 and 21 of the shape mentioned above is formed in the copper plate 13, the cooling efficiency of the copper plate 13 vicinity of the meniscus part can be improved.
Further, the continuous portion of the meniscus water guide portion 23 and the mold water guide portion 24 of the water guide groove 20 and the continuous portion of the meniscus water guide portion 25 and the mold water guide portion 26 of the water guide groove 21 are each configured with a gentle curved surface, Since the upper end part and the lower end part of the water guide grooves 20 to 22 are each formed of a gentle curved surface, the resistance to the flow of industrial water flowing from the lower side member 10 to the upper side can be reduced.
[0021]
As shown in FIGS. 1, 2, 3 (A), 3 (B), and 4, each meniscus water guide section adjacent to one side of the back surface of the copper plate 13 on which a large number of meniscus water guide sections 23, 25 are formed. A recess 27 that communicates with the passages 23 and 25 is formed. The concave portion 27 has a rectangular shape when viewed from the back, and the distance from the joint surface between the copper plate 13 and the back plate 15 to the bottom of the concave portion 27 determines the arrangement position of each meniscus water guiding portion 23, 25, and It is set to, for example, 1/10 to 1/3 of the thickness of the copper plate 13 according to the flow rate of the flowing industrial water.
[0022]
The recess 27 is provided with a closing member 28 made of, for example, a copper plate, a stainless steel plate or the like, which is a metal plate having corrosion resistance corresponding to the shape of the recess 27. Thereby, the closure member 28 can be arrange | positioned to a part (for example, 1/5-1/2 of the depth of the meniscus water conveyance parts 23 and 25) of the depth direction of each meniscus water conveyance part 23 and 25. FIG. The lower end portion and the upper end portion of the closing member 28 are processed into a gently inclined state in order to reduce resistance to the flow of industrial water flowing through the water guide grooves 20 and 21, respectively. The closing member 28 is attached to the copper plate 13 by a bolt 29 which is an example of a fixing means, and is fixed to the copper plate 13.
[0023]
As described above, the meniscus water guiding portions 23 and 25 are arranged on the surface side of the copper plate 13 with respect to the mold water guiding portions 24 and 26, and the cross-sectional areas of the meniscus water guiding portions 23 and 25 are set as the mold water guiding portions 24 and 26. Is disposed in the recess 27 so that the flow rate of the industrial water flowing through the meniscus water conveyance portions 23, 25 is faster or equal to the flow rate of the industrial water flowing through the mold water conveyance portions 24, 26. Therefore, the cooling efficiency of the copper plate 13 in the vicinity of the meniscus portion can be increased.
Therefore, better cooling efficiency can be obtained by using industrial water having the same flow rate as before, which is economical.
[0024]
【Example】
(Numerical analysis)
Then, the result of having conducted the heat conduction analysis (FEM analysis) using the long side copper plate 13 of the above-mentioned continuous casting mold will be described.
As shown in FIGS. 5A, 5B, and 6A, the dimensions of the long-side copper plate 13 used for the heat conduction analysis are as follows. The distance between the centers of the adjacent female screw portions 18 is 152 mm, the width of the water guide grooves 21 and 22 is 5 mm, the distance W1 between the adjacent water guide grooves 20 is 17 mm, the distance W2 between the adjacent water guide grooves 21 is 9 mm, and the distance between the water guide grooves 20 d1 is 23 mm, and the distance d2 of the water guide groove 21 is 21 mm.
Further, as a conventional example, as shown in FIG. 6B, a long side copper plate 30 which is different from the long side copper plate 13 only in the shape and arrangement position of the water guide groove is used for the heat conduction analysis. Five water guide grooves 31 are formed between the adjacent female screw portions 32, and the distance d3 from the surface of the copper plate 30 to the groove bottom of the water guide groove 31 is the same as the distance d2 of the water guide groove 21 of the long side copper plate 13. The depth is 25 mm.
[0025]
As a result of analysis using the copper plate 13 having the above-described configuration, as shown in FIGS. 7A and 7B, the vicinity of the meniscus portion on the surface side of the copper plate 13 has the highest temperature. I understand. Moreover, also about the result analyzed using the long side copper plate 30 of a prior art example, as shown in FIG. 8, it turns out that the meniscus part vicinity of the surface side of the long side copper plate 30 is the highest temperature.
[0026]
Here, the temperature distribution of the cross-section of each long-side copper plate 13, 30 at the highest temperature portion (portion of about 160 mm from the upper end of each long-side copper plate 13, 30) is shown in FIGS. Show. In addition, in the cross section of each long side copper plate 13,30, it is the surface of long side copper plate 13,30, Comprising: The center position between adjacent female screw parts 18 and 32 is point a, and the position of female screw parts 18 and 32 is b point. In addition, the groove bottoms of the water guide grooves (slits) 20, 21, and 31 are c points at the center position between the adjacent female screw portions 18 and 32, and d points are the positions of the side portions of the female screw portions 18 and 32, respectively. Set. Here, Table 1 shows the temperatures at the points a to d when the casting speed is changed in three stages of 1.0, 1.5, and 2.0 (m / min).
[0027]
[Table 1]

[0028]
As is apparent from Table 1, when the casting speed is set to 1.0 (m / min), by using the long side copper plate 13, the temperature at the groove bottom (point c, point d) is 8 ° C. It was confirmed that the temperature could be lowered from 19 to 21 ° C. at a temperature of (point a, point b), compared to the conventional long-side copper plate 30. This temperature decrease is the same even when the casting speed is increased. When the casting speed is set to a high speed of 2.0 (m / min), by using the long side copper plate 13, the groove bottom ( 10 to 11 ° C. at the temperature of the c point and d point), 22 to 26 ° C. at the temperature of the surface (points a and b), and lower than the long side copper plate 30 of the conventional example.
[0029]
Further, when the casting speed is set to 2.0 (m / min), the temperature of the groove bottom of the long side copper plate 13 is 126 to 132 ° C., for example, when the cooling water back pressure is 0.2 (MPa). Since the boiling point of water is lower than 133 ° C., it is possible to suppress the promotion of scale adhesion.
On the other hand, when the casting speed is set to 2.0 (m / min), the temperature of the groove bottom of the conventional long side copper plate 30 is 136 to 143 ° C., and the cooling water back pressure is 0.2 (MPa). Since the boiling point of water exceeds 133 ° C., the adhesion of scale is promoted.
From the above, by using the continuous casting mold provided with the long side copper plate 13, it is possible to cope with high speed casting and to manufacture a slab having good quality.
[0030]
As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. Other embodiments and modifications conceivable within the scope of the above are also included. For example, the case where the continuous casting mold of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
Moreover, in the said embodiment, although the case where copper was used as a metal with favorable heat conductivity was demonstrated, if heat conductivity is favorable, other metals, copper alloys, etc. can also be used, for example. It is.
And in the said embodiment, about the case where the recessed part which connects each adjacent meniscus water guide part is formed in the back surface side surface of the casting_mold | template main body in which many meniscus water guide parts were formed, and the obstruction | occlusion member is arrange | positioned in this recessed part As described above, it is also possible to dispose a blocking member corresponding to the cross-sectional shape of the meniscus water guide portion in part of the depth direction of each meniscus water guide portion.
[0031]
【The invention's effect】
In the casting mold for continuous casting according to claims 1 and 2, since the cooling efficiency of the peripheral portion of the meniscus portion that is the highest temperature in the mold body can be increased, the casting speed is increased to increase the thermal load on the mold body. In this case, the mold body can be properly cooled, and a slab of stable quality can be manufactured.
Moreover, the manufacturing cost of a casting_mold | template can be reduced by making the depth of a casting_mold | template water conveyance part shallower than the depth of a meniscus water conveyance part.
And, for example, it is possible to increase the cooling efficiency of the mold body of the meniscus water guide section without increasing the supply amount of cooling water than before, so without changing each device of the conventionally used continuous casting equipment A continuous casting mold that can be used can be provided.
[0032]
In particular, in a continuous casting mold according to claim 1, it is possible to enhance the cooling efficiency of the meniscus portion of the mold body, can produce a slab of high quality, it is possible to carry out the casting operation stably.
In continuous casting mold according to claim 2, it is possible to simplify the shape of the closure member, for example, it can reduce the cost of shaping of the closing member with an economical, workability at the time of manufacturing is improved.
In the continuous casting mold according to claim 1, since the interval between a large number of adjacent water guide grooves is set, the water guide grooves can be arranged so that the cooling efficiency is higher than the conventional one, and the cooling efficiency of the mold body is further increased. Can be increased.
[Brief description of the drawings]
FIG. 1 is a rear view of a long side copper plate of a mold body of a continuous casting mold according to an embodiment of the present invention.
FIG. 2 is a partially enlarged view of the same long side copper plate.
3A to 3C are respectively a cross-sectional view taken along the line aa, a cross-sectional view taken along the line bb in FIG. 2, and a cross-sectional view taken along the line cc in FIG.
4 is a cross-sectional view taken along the line dd in FIG.
5A is a rear view of a long-side copper plate water channel model used for numerical analysis, and FIG. 5B is a cross-sectional view taken along the line ee of FIG.
6A is a cross-sectional view taken along the line ff in FIG. 5A, and FIG. 6B is an explanatory diagram of a water channel model of a long-side copper plate according to a conventional example.
7A and 7B are explanatory diagrams of the temperature distribution on the front side and the temperature distribution on the back side of the long-side copper plate based on the numerical analysis results, respectively.
FIG. 8 is an explanatory diagram of a temperature distribution on the surface side of a long-side copper plate according to a conventional example.
9A and 9B are explanatory diagrams of the temperature distribution of the meniscus portion of the long side copper plate based on the numerical analysis results, respectively, and the temperature distribution based on the numerical analysis result of the meniscus portion of the long side copper plate according to the conventional example. It is explanatory drawing.
FIG. 10 is a plan view of a continuous casting mold.
11A is an explanatory view of a long side copper plate of a continuous casting mold, and FIG. 11B is a cross-sectional view taken along the line gg in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10, 11: Long side member, 12: Water flow part, 13: Long side copper plate, 14: Mounting means, 15: Back plate (support member), 16: Water supply part, 17: Drain part, 18: Female screw part, 19 : O-ring, 20-22: Water guide groove, 23: Meniscus water guide, 24: Mold water guide, 25: Meniscus water guide, 26: Mold water guide, 27: Recess, 28: Closure member, 29: Bolt, 30: Long side copper plate, 31: water guide groove, 32: female thread

Claims (2)

The mold body is made of a metal having good thermal conductivity and has a water passage on the back surface side, and a support member fixed to the back surface side of the mold body by attachment means. In the continuous casting mold for cooling the mold body by flowing cooling water through the water supply section and the drainage section to the water flow section,
The water flow portion has a meniscus water conveyance portion disposed vertically with the meniscus portion of the mold body as a center, and a mold water conveyance portion disposed in another part of the mold body in communication with the meniscus water conveyance portion. A plurality of water guide grooves arranged in parallel vertically, the groove bottom of the meniscus water guide section is formed on the surface side of the mold body with respect to the groove bottom of the mold water guide section, and the depth direction of the meniscus water guide section A blocking member for reducing the cross-sectional area of the meniscus water guide portion is disposed at a part of the cooling water, and the flow rate of the cooling water flowing through the meniscus water guide portion is faster or equal to the flow rate of the cooling water flowing through the mold water guide portion. And
Further, the interval between the plurality of adjacent water guide grooves is set to 10 to 30 mm, and the mold is determined by the distance between the adjacent water guide grooves provided in the central portion of the mounting means adjacent in the width direction of the mold body. Narrow the interval between adjacent water guide grooves provided in the vicinity of the attachment means of the main body,
The ratio d / D between the distance d from the surface of the mold body to the groove bottom of the meniscus water guiding portion and the distance D from the surface of the mold body to the groove bottom of the mold water guiding portion is 2/5. 4/5, and from the surface of the mold main body from the distance from the surface of the mold main body to the groove bottom of the meniscus water guide portion provided at the center of the mounting means adjacent in the width direction of the mold main body. A casting mold for continuous casting, characterized in that a distance to the groove bottom of the meniscus water guide portion provided in the vicinity of the attaching means of the mold body is shortened . 2. The continuous casting mold according to claim 1 , wherein a concave portion that communicates each adjacent meniscus water guiding portion is formed on one surface of the mold body on which the plurality of meniscus water guiding portions are formed. A casting mold for continuous casting, wherein the closing member made of a metal plate having corrosion resistance is disposed.

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